blocked domains to a community-driven list allowing subscribers to suggest sites for blocking; if enough subscribers (the number has not been disclosed) concur with the categorization of a site, it is added to the appropriate category for blocking. there were over 60 categories. The basic OpenDNS service does not require users to register, but using the customizable block feature requires registration. Other free, built-in features include a phishing filter. OpenDNS also run a service called PhishTank for users to submit and review suspected phishing sites. OpenDNS supports the DNSCrypt protocol, which authenticates DNS traffic between the user's computer and the name servers. This requires installing free software onto supported devices. In December 2007 OpenDNS began offering the free DNS-O-Matic service to provide a method of sending dynamic DNS (DDNS) updates to several DDNS providers using DynDNS's update API. In October 2009 OpenDNS launched charged-for premium services called Home VIP that offer increased reporting and block features, and other services. DNS service for paid business use In 2009 OpenDNS launched OpenDNS Enterprise, a first foray into enterprise-grade network security. OpenDNS Enterprise included the ability to share management of the product across a team, along with an audit log, expanded malware protection, daily network statistic reports, and a custom block page URL. OpenDNS expanded on the Enterprise product in July 2012 with OpenDNS Insights. This new service featured integration with Microsoft Active Directory, which allowed admins granular control over creating policies on a per-user, per-device, and per-group basis. Umbrella In November 2012 OpenDNS launched its network security product suite called Umbrella, designed to enforce security policies for mobile employees who work beyond the corporate network using roaming devices such as Windows and Mac laptops, iPhones, and iPads, and provides granular network security for all devices behind the network perimeter. In February 2013 the company launched the OpenDNS Security Graph to support Umbrella. Security graph is a data-driven threat intelligence engine that automatically updates malware, botnet, and phishing domain and IP blacklists enforced by Umbrella. The data is sourced from the DNS requests OpenDNS receives, plus the BGP routing tables that are managed by OpenDNS's network operations center. Added features OpenDNS introduced the Investigate feature to Umbrella in November 2013. It allows security teams to compare local to global traffic to help determine the intent of an attack, and help incident response teams prioritize events. In January 2014 the Intelligent Proxy feature was